A technique for performing beam failure detection, BFD, of a radio beam between a radio device (100) and a radio access node (200) in a radio access network, RAN (600), is described. As to a method aspect of the technique performed by the radio device (100), a control message is received from the RAN (600). The control message is indicative of a spatial relation between a first physical channel (602) and a second physical channel (608). A transmission or a transmission attempt to the radio access node (200) is monitored on the second physical channel (608). The transmission or transmission attempt uses a filter (604) in the spatial domain (506), which is used or configured for a transmission (302) to the radio access node (200) or a reception (302) from the radio access node (200) on the first physical channel (602) according to the spatial relation. The BFD is performed based on a result of the monitoring.
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